Thermal decomposition of barium ferrate(VI): Mechanism and formation of Fe-IV intermediate and nanocrystalline Fe2O3 and ferrite uri icon

abstract

  • 2016 Elsevier B.V. All rights reserved. Simple high-valent iron-oxo species, ferrate(VI) (FeVIO42-, Fe(VI)) has applications in energy storage, organic synthesis, and water purification. Of the various salts of Fe(VI), barium ferrate(VI) (BaFeO4) has also a great potential as a battery material. This paper presents the thermal decomposition of BaFeO4 in static air and nitrogen atmosphere, monitored by combination of thermal analysis, Mssbauer spectroscopy, X-ray powder diffraction, and electron-microscopic techniques. The formation of FeIV species in the form of BaFeO3 was found to be the primary decomposition product of BaFeO4 at temperature around 190 C under both studied atmospheres. BaFeO3 was unstable in air reacting with CO2 to form barium carbonate and speromagnetic amorphous iron(III) oxide nanoparticles (<5 nm). Above 600 C, a solid state reaction between BaCO3 and Fe2O3 occurred, leading to the formation of barium ferrite nanoparticles, BaFe2O4 (20-100 nm).

published proceedings

  • JOURNAL OF ALLOYS AND COMPOUNDS

author list (cited authors)

  • Machala, L., Sharma, V. K., Kuzmann, E., Homonnay, Z., Filip, J., & Kralchevska, R. P.

citation count

  • 7

complete list of authors

  • Machala, Libor||Sharma, Virender K||Kuzmann, Ernoe||Homonnay, Zoltan||Filip, Jan||Kralchevska, Radina P

publication date

  • May 2016